From dda911c253fc38c54603020aa196a0fb84d14612 Mon Sep 17 00:00:00 2001
From: Heyward Fann <fannheyward@gmail.com>
Date: Wed, 11 Aug 2021 17:30:05 +0800
Subject: [PATCH 1/2] feat: range hover

close #836
FYI #256
---
 src/client.ts  | 17 ++++++++++++++++-
 src/lsp_ext.ts | 10 +++++++++-
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/src/client.ts b/src/client.ts
index 5df479d4..c23c27b0 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -1,9 +1,10 @@
-import { CodeActionKind, Command, Executable, LanguageClient, LanguageClientOptions, ServerOptions, StaticFeature, Uri, workspace } from 'coc.nvim';
+import { CodeActionKind, Command, Executable, LanguageClient, LanguageClientOptions, Position, Range, ServerOptions, StaticFeature, Uri, workspace } from 'coc.nvim';
 import { existsSync } from 'fs';
 import { join } from 'path';
 import { CodeAction, CodeActionParams, CodeActionRequest } from 'vscode-languageserver-protocol';
 import { Env } from './config';
 import { isRustDocument } from './ctx';
+import * as ra from './lsp_ext';
 
 class ExperimentalFeatures implements StaticFeature {
   fillClientCapabilities(capabilities: any): void {
@@ -62,6 +63,20 @@ export function createClient(bin: string, extra: Env): LanguageClient {
     documentSelector: [{ language: 'rust' }],
     initializationOptions,
     middleware: {
+      async provideHover(document, position, token) {
+        let positionOrRange: Range | Position | null = null;
+        const mode = (await workspace.nvim.call('mode')) as string;
+        if (mode === 'v' || mode === 'V') {
+          const doc = workspace.getDocument(document.uri);
+          positionOrRange = await workspace.getSelectedRange(mode, doc);
+        }
+        if (!positionOrRange) positionOrRange = position;
+        const param: ra.HoverParams = {
+          position: positionOrRange || position,
+          textDocument: { uri: document.uri },
+        };
+        return await client.sendRequest(ra.hover, param, token);
+      },
       async resolveCompletionItem(item, token, next) {
         if (item.data && !item.data.position) {
           // TODO: remove this if coc undefined item.data
diff --git a/src/lsp_ext.ts b/src/lsp_ext.ts
index 2905f32e..9bff239c 100644
--- a/src/lsp_ext.ts
+++ b/src/lsp_ext.ts
@@ -19,6 +19,14 @@ export const serverStatus = new lc.NotificationType<ServerStatusParams>('experim
 
 export const reloadWorkspace = new lc.RequestType0<null, void>('rust-analyzer/reloadWorkspace');
 
+export const hover = new lc.RequestType<HoverParams, lc.Hover | null, void>('textDocument/hover');
+
+export interface HoverParams {
+  workDoneToken?: lc.ProgressToken;
+  textDocument: lc.TextDocumentIdentifier;
+  position: lc.Range | lc.Position;
+}
+
 export interface SyntaxTreeParams {
   textDocument: lc.TextDocumentIdentifier;
   range: lc.Range | null;
@@ -55,7 +63,7 @@ export interface MatchingBraceParams {
 }
 export const matchingBrace = new lc.RequestType<MatchingBraceParams, lc.Position[], void>('experimental/matchingBrace');
 
-export const parentModule = new lc.RequestType<lc.TextDocumentPositionParams, lc.Location[] | lc.LocationLink[], void>('experimental/parentModule');
+export const parentModule = new lc.RequestType<lc.TextDocumentPositionParams, lc.LocationLink[], void>('experimental/parentModule');
 
 export interface JoinLinesParams {
   textDocument: lc.TextDocumentIdentifier;

From be4cb7a7707f8dc06b470ed7e9f8ce7bff950fb0 Mon Sep 17 00:00:00 2001
From: Heyward Fann <fannheyward@gmail.com>
Date: Thu, 12 Aug 2021 09:23:38 +0800
Subject: [PATCH 2/2] fix: range hover

---
 src/client.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/client.ts b/src/client.ts
index c23c27b0..eede1dba 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -68,6 +68,7 @@ export function createClient(bin: string, extra: Env): LanguageClient {
         const mode = (await workspace.nvim.call('mode')) as string;
         if (mode === 'v' || mode === 'V') {
           const doc = workspace.getDocument(document.uri);
+          await workspace.nvim.call('eval', 'feedkeys("\\<esc>", "in")');
           positionOrRange = await workspace.getSelectedRange(mode, doc);
         }
         if (!positionOrRange) positionOrRange = position;